PyWA MCP Server

Instructions

Implementation Reference

• tools/messaging.py:14-59 (handler)

  The send_message tool handler - an async function decorated with @mcp.tool() that sends text messages to WhatsApp users. It accepts parameters like 'to', 'text', 'header', 'footer', 'preview_url', and 'reply_to_message_id', calls wa_client.send_message(), and returns a dict with success status and message ID.

  @mcp.tool()
  async def send_message(
      to: str,
      text: str,
      header: Optional[str] = None,
      footer: Optional[str] = None,
      *,
      preview_url: bool = False,
      reply_to_message_id: Optional[str] = None,
  ) -> dict:
      """
      Send a text message to a WhatsApp user.
      
      Args:
          to: Phone number (with country code) or WhatsApp ID
          text: The text message content
          header: Optional header text (for interactive messages)
          footer: Optional footer text (for interactive messages)
          preview_url: Whether to show URL previews (default False)
          reply_to_message_id: Message ID to reply to
      
      Returns:
          Dictionary with success status and message ID
      """
      try:
          result = wa_client.send_message(
              to=to,
              text=text,
              header=header,
              footer=footer,
              preview_url=preview_url,
              reply_to_message_id=reply_to_message_id,
          )
          
          logger.info(f"Message sent to {to}")
          # Extract just the message ID if result is a complex object
          message_id = getattr(result, 'id', str(result)) if result else None
          
          return {
              "success": True,
              "message_id": message_id,
              "to": to,
          }
      except Exception as e:
          logger.error(f"Failed to send message: {str(e)}")
          return {"success": False, "error": str(e)}

• tools/messaging.py:11-544 (registration)

  The register_messaging_tools function that registers all messaging tools including send_message with the MCP server. This function is called from tools/__init__.py to register tools at startup.

  def register_messaging_tools(mcp, wa_client: WhatsApp):
      """Register all messaging-related tools."""
      
      @mcp.tool()
      async def send_message(
          to: str,
          text: str,
          header: Optional[str] = None,
          footer: Optional[str] = None,
          *,
          preview_url: bool = False,
          reply_to_message_id: Optional[str] = None,
      ) -> dict:
          """
          Send a text message to a WhatsApp user.
          
          Args:
              to: Phone number (with country code) or WhatsApp ID
              text: The text message content
              header: Optional header text (for interactive messages)
              footer: Optional footer text (for interactive messages)
              preview_url: Whether to show URL previews (default False)
              reply_to_message_id: Message ID to reply to
          
          Returns:
              Dictionary with success status and message ID
          """
          try:
              result = wa_client.send_message(
                  to=to,
                  text=text,
                  header=header,
                  footer=footer,
                  preview_url=preview_url,
                  reply_to_message_id=reply_to_message_id,
              )
              
              logger.info(f"Message sent to {to}")
              # Extract just the message ID if result is a complex object
              message_id = getattr(result, 'id', str(result)) if result else None
              
              return {
                  "success": True,
                  "message_id": message_id,
                  "to": to,
              }
          except Exception as e:
              logger.error(f"Failed to send message: {str(e)}")
              return {"success": False, "error": str(e)}
      
      
      @mcp.tool()
      async def send_image(
          to: str,
          image: str,
          caption: Optional[str] = None,
          footer: Optional[str] = None,
          *,
          reply_to_message_id: Optional[str] = None,
      ) -> dict:
          """
          Send an image message.
          
          Args:
              to: Phone number or WhatsApp ID
              image: Image URL or media ID
              caption: Optional image caption
              footer: Optional footer text
              reply_to_message_id: Message ID to reply to
          
          Returns:
              Dictionary with success status and message ID
          """
          try:
              result = wa_client.send_image(
                  to=to,
                  image=image,
                  caption=caption,
                  footer=footer,
                  reply_to_message_id=reply_to_message_id,
              )
              
              logger.info(f"Image sent to {to}")
              message_id = getattr(result, 'id', str(result)) if result else None
              return {"success": True, "message_id": message_id}
          except Exception as e:
              logger.error(f"Failed to send image: {str(e)}")
              return {"success": False, "error": str(e)}
      
      
      @mcp.tool()
      async def send_video(
          to: str,
          video: str,
          caption: Optional[str] = None,
          footer: Optional[str] = None,
          *,
          reply_to_message_id: Optional[str] = None,
      ) -> dict:
          """
          Send a video message.
          
          Args:
              to: Phone number or WhatsApp ID
              video: Video URL or media ID
              caption: Optional video caption
              footer: Optional footer text
              reply_to_message_id: Message ID to reply to
          
          Returns:
              Dictionary with success status and message ID
          """
          try:
              result = wa_client.send_video(
                  to=to,
                  video=video,
                  caption=caption,
                  footer=footer,
                  reply_to_message_id=reply_to_message_id,
              )
              
              logger.info(f"Video sent to {to}")
              message_id = getattr(result, 'id', str(result)) if result else None
              return {"success": True, "message_id": message_id}
          except Exception as e:
              logger.error(f"Failed to send video: {str(e)}")
              return {"success": False, "error": str(e)}
      
      
      @mcp.tool()
      async def send_document(
          to: str,
          document: str,
          filename: Optional[str] = None,
          caption: Optional[str] = None,
          footer: Optional[str] = None,
          *,
          reply_to_message_id: Optional[str] = None,
      ) -> dict:
          """
          Send a document message.
          
          Args:
              to: Phone number or WhatsApp ID
              document: Document URL or media ID
              filename: Optional filename for the document
              caption: Optional document caption
              footer: Optional footer text
              reply_to_message_id: Message ID to reply to
          
          Returns:
              Dictionary with success status and message ID
          """
          try:
              result = wa_client.send_document(
                  to=to,
                  document=document,
                  filename=filename,
                  caption=caption,
                  footer=footer,
                  reply_to_message_id=reply_to_message_id,
              )
              
              logger.info(f"Document sent to {to}")
              message_id = getattr(result, 'id', str(result)) if result else None
              return {"success": True, "message_id": message_id}
          except Exception as e:
              logger.error(f"Failed to send document: {str(e)}")
              return {"success": False, "error": str(e)}
      
      
      @mcp.tool()
      async def send_audio(
          to: str,
          audio: str,
          *,
          reply_to_message_id: Optional[str] = None,
      ) -> dict:
          """
          Send an audio message.
          
          Args:
              to: Phone number or WhatsApp ID
              audio: Audio URL or media ID
              reply_to_message_id: Message ID to reply to
          
          Returns:
              Dictionary with success status and message ID
          """
          try:
              result = wa_client.send_audio(
                  to=to,
                  audio=audio,
                  reply_to_message_id=reply_to_message_id,
              )
              
              logger.info(f"Audio sent to {to}")
              message_id = getattr(result, 'id', str(result)) if result else None
              return {"success": True, "message_id": message_id}
          except Exception as e:
              logger.error(f"Failed to send audio: {str(e)}")
              return {"success": False, "error": str(e)}
      
      
      @mcp.tool()
      async def send_sticker(
          to: str,
          sticker: str,
          *,
          reply_to_message_id: Optional[str] = None,
      ) -> dict:
          """
          Send a sticker message.
          
          Args:
              to: Phone number or WhatsApp ID
              sticker: Sticker URL or media ID (must be webp format)
              reply_to_message_id: Message ID to reply to
          
          Returns:
              Dictionary with success status and message ID
          """
          try:
              result = wa_client.send_sticker(
                  to=to,
                  sticker=sticker,
                  reply_to_message_id=reply_to_message_id,
              )
              
              logger.info(f"Sticker sent to {to}")
              message_id = getattr(result, 'id', str(result)) if result else None
              return {"success": True, "message_id": message_id}
          except Exception as e:
              logger.error(f"Failed to send sticker: {str(e)}")
              return {"success": False, "error": str(e)}
      
      
      @mcp.tool()
      async def send_location(
          to: str,
          latitude: float,
          longitude: float,
          name: Optional[str] = None,
          address: Optional[str] = None,
          *,
          reply_to_message_id: Optional[str] = None,
      ) -> dict:
          """
          Send a location message.
          
          Args:
              to: Phone number or WhatsApp ID
              latitude: Latitude of the location
              longitude: Longitude of the location
              name: Optional location name
              address: Optional location address
              reply_to_message_id: Message ID to reply to
          
          Returns:
              Dictionary with success status and message ID
          """
          try:
              result = wa_client.send_location(
                  to=to,
                  latitude=latitude,
                  longitude=longitude,
                  name=name,
                  address=address,
                  reply_to_message_id=reply_to_message_id,
              )
              
              logger.info(f"Location sent to {to}")
              message_id = getattr(result, 'id', str(result)) if result else None
              return {"success": True, "message_id": message_id}
          except Exception as e:
              logger.error(f"Failed to send location: {str(e)}")
              return {"success": False, "error": str(e)}
      
      
      @mcp.tool()
      async def request_location(
          to: str,
          text: str,
          *,
          reply_to_message_id: Optional[str] = None,
      ) -> dict:
          """
          Request user's location.
          
          Args:
              to: Phone number or WhatsApp ID
              text: Message text asking for location
              reply_to_message_id: Message ID to reply to
          
          Returns:
              Dictionary with success status and message ID
          """
          try:
              result = wa_client.request_location(
                  to=to,
                  text=text,
                  reply_to_message_id=reply_to_message_id,
              )
              
              logger.info(f"Location request sent to {to}")
              message_id = getattr(result, 'id', str(result)) if result else None
              return {"success": True, "message_id": message_id}
          except Exception as e:
              logger.error(f"Failed to request location: {str(e)}")
              return {"success": False, "error": str(e)}
      
      
      @mcp.tool()
      async def send_contact(
          to: str,
          contact_name: str,
          contact_phone: str,
          *,
          reply_to_message_id: Optional[str] = None,
      ) -> dict:
          """
          Send a contact card.
          
          Args:
              to: Phone number or WhatsApp ID
              contact_name: Name of the contact
              contact_phone: Phone number of the contact
              reply_to_message_id: Message ID to reply to
          
          Returns:
              Dictionary with success status and message ID
          """
          try:
              # Create Contact object
              contact = Contact(
                  name=Contact.Name(formatted_name=contact_name),
                  phones=[Contact.Phone(phone=contact_phone)]
              )
              
              result = wa_client.send_contact(
                  to=to,
                  contact=contact,
                  reply_to_message_id=reply_to_message_id,
              )
              
              logger.info(f"Contact sent to {to}")
              message_id = getattr(result, 'id', str(result)) if result else None
              return {"success": True, "message_id": message_id}
          except Exception as e:
              logger.error(f"Failed to send contact: {str(e)}")
              return {"success": False, "error": str(e)}
      
      
      @mcp.tool()
      async def send_reaction(
          to: str,
          emoji: str,
          message_id: str,
          *,
          sender: Optional[str] = None,
      ) -> dict:
          """
          Send a reaction to a message.
          
          Args:
              to: Phone number or WhatsApp ID
              emoji: Reaction emoji
              message_id: ID of message to react to
              sender: Optional sender phone ID
          
          Returns:
              Dictionary with success status
          """
          try:
              result = wa_client.send_reaction(
                  to=to,
                  emoji=emoji,
                  message_id=message_id,
                  sender=sender,
              )
              
              logger.info(f"Reaction sent to message {message_id}")
              result_data = str(result) if result else None
              return {"success": True, "result": result_data}
          except Exception as e:
              logger.error(f"Failed to send reaction: {str(e)}")
              return {"success": False, "error": str(e)}
      
      
      @mcp.tool()
      async def remove_reaction(
          to: str,
          message_id: str,
          *,
          sender: Optional[str] = None,
      ) -> dict:
          """
          Remove a reaction from a message.
          
          Args:
              to: Phone number or WhatsApp ID
              message_id: ID of message to remove reaction from
              sender: Optional sender phone ID
          
          Returns:
              Dictionary with success status
          """
          try:
              result = wa_client.remove_reaction(
                  to=to,
                  message_id=message_id,
                  sender=sender,
              )
              
              logger.info(f"Reaction removed from message {message_id}")
              result_data = str(result) if result else None
              return {"success": True, "result": result_data}
          except Exception as e:
              logger.error(f"Failed to remove reaction: {str(e)}")
              return {"success": False, "error": str(e)}
      
      
      @mcp.tool()
      async def mark_message_as_read(
          message_id: str,
          *,
          sender: Optional[str] = None,
      ) -> dict:
          """
          Mark a message as read.
          
          Args:
              message_id: The WhatsApp message ID to mark as read
              sender: Optional phone ID
          
          Returns:
              Dictionary with success status
          """
          try:
              result = wa_client.mark_message_as_read(
                  message_id=message_id,
                  sender=sender,
              )
              
              logger.info(f"Message {message_id} marked as read")
              result_data = str(result) if result else None
              return {"success": True, "result": result_data}
          except Exception as e:
              logger.error(f"Failed to mark message as read: {str(e)}")
              return {"success": False, "error": str(e)}
      
      
      @mcp.tool()
      async def indicate_typing(
          message_id: str,
          *,
          sender: Optional[str] = None,
      ) -> dict:
          """
          Show typing indicator to WhatsApp user.
          
          This marks a message as read and displays a typing indicator to show
          the user that you are preparing a response. Best practice when it will
          take a few seconds to respond.
          
          IMPORTANT NOTES:
          - Typing indicator lasts max 25 seconds or until you send a message
          - Only use if you are actually going to respond  
          - Will be dismissed when you send the next message
          - Improves user experience for delayed responses
          
          EXAMPLE:
          {
            "message_id": "wamid.HBgNMjc2NTY4NjY5MDUVAgARGBI5QTNDMEM3RjVBMzY2Q0Y4AA=="
          }
          
          Args:
              message_id: The WhatsApp message ID to respond to (from incoming message)
              sender: Optional phone ID (defaults to client's phone ID)
          
          Returns:
              Dictionary with success status
          """
          try:
              result = wa_client.indicate_typing(
                  message_id=message_id,
                  sender=sender,
              )
              
              logger.info(f"Typing indicator shown for message {message_id}")
              # SuccessResult has a success boolean attribute
              success_status = getattr(result, 'success', bool(result))
              
              return {
                  "success": True, 
                  "typing_indicated": success_status,
                  "message_id": message_id
              }
          except Exception as e:
              logger.error(f"Failed to indicate typing: {str(e)}")
              return {"success": False, "error": str(e)}
      
      
      @mcp.tool()
      async def upload_media(
          media_path: str,
          *,
          mime_type: Optional[str] = None,
      ) -> dict:
          """
          Upload media file to WhatsApp servers.
          
          Args:
              media_path: Path to media file
              mime_type: Optional MIME type
          
          Returns:
              Dictionary with media ID
          """
          try:
              media_obj = wa_client.upload_media(
                  media=media_path,
                  mime_type=mime_type,
              )
              
              logger.info("Media uploaded successfully")
              return {
                  "success": True, 
                  "media_id": str(media_obj),
                  "media_type": type(media_obj).__name__
              }
          except Exception as e:
              logger.error(f"Failed to upload media: {str(e)}")
              return {"success": False, "error": str(e)}

• tools/__init__.py:14-18 (registration)

  The register_all_tools function that orchestrates tool registration, calling register_messaging_tools which in turn registers the send_message tool via the @mcp.tool() decorator.

  def register_all_tools(mcp, wa_client):
      """Register all available tools with the MCP server."""
      register_messaging_tools(mcp, wa_client)
      register_interactive_tools(mcp, wa_client)
      register_template_tools(mcp, wa_client)